Hull plate in ice-transiting ships can sustain significant local damage during operation as a result of ice impact, and therefore isolated regions of ship plate are plastically deformed. Four grades of ship plate (B, EH36, DH36, NVF 440) with a range of as-received toughness characteristics were deformed to two levels of cold work (10 % and 20 % tensile strains, thickness reductions of 8 % and 15 %) and their toughness measured. Increasing the amount of cold deformation caused deterioration in toughness in two ways: an increase in the brittle to ductile transition temperature, and a drop in resistance to ductile tearing. The former will raise the service temperature at which brittle fracture initiation is possible and the second will enhance the risk of developing long ductile fractures. It was found that significant deterioration of toughness occured for all four steels for deformation of the order of 10 %. Implications for the integrity of damaged hull structure as a result of the deterioration in toughness is discussed.


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    Title :

    Effects of plastic deformation on fracture toughness of ship plate steels


    Additional title:

    Die Einflüsse der plastischen Verformung auf die Bruchzähigkeit von Schiffsblechstählen


    Contributors:
    Pussegoda, L.N. (author) / Malik, L. (author) / Tyson, W.R. (author)

    Published in:

    Publication date :

    1997


    Size :

    9 Seiten, 8 Bilder, 6 Tabellen, 10 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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